{"instruction": "You are an expert in named entity recognition. Please extract entities that match the schema definition from the input. Return an empty list if the entity type does not exist. Please respond in the format of a JSON string.", "schema": ["material", "process characterization", "concept or principle", "process parameter", "enabling technology", "manufacturing process"], "input": "Reflecting the strategy of some companies like ExOne or Voxeljet , the professional 3D printers can be combined to the production line and offer the largest printers on the world market for 3D printing of sand and metal materials ."}
{"material": ["be", "sand", "metal materials"], "process characterization": [], "concept or principle": [], "process parameter": [], "enabling technology": [], "manufacturing process": ["production line", "3D printing"]}